.change-bg-btn {
	  position: fixed;
	  right: 30rpx;
	  bottom: 30rpx;
	  padding: 15rpx 30rpx;
	  background: rgba(255, 255, 255, 0.8);
	  border-radius: 40rpx;
	  font-size: 28rpx;
	  color: #666;
	  box-shadow: 0 4rpx 12rpx rgba(0, 0, 0, 0.1);
	  z-index: 999;
	  transition: all 0.3s;
	}
	
	.change-bg-btn:active {
	  transform: scale(0.95);
	  background: rgba(255, 255, 255, 1);
	}